Loud speaker



. 1,643,02 Sept zo 1927 c. w. PETERSON 9 LOUD S PEAKE R Filed Deo. 50, 1925 JNVENTOR.

A TTORNEYS Paented Sepia. 20, i927.,

, a narrar nari CHARLES W. PETERSON, OF DETROIT, MCHIGAN.

noun spannen.

` fpplcabanled December 3G, 1925,

Mv invention reales to cone type loud speakers 'and more particulanly to that species of cone type loud speaker in which Vche conical diaphraoin is supported at the edge so as io loe freertio move as a Whole on its mounting with the lower vibrations, and so as io he given no particular period' of inherent vihraiion at the edges7 as would. he

Jche case were the diaphragm supported on 1c tongues or springs.

The objects of my present invention are confined to the easy vand sightly mounting of a conical diaphragm in a frame, hound with an aperiodic substance or otherwise, which mounting is safe and strong, and avoids defects of structure which are to he found in other similar devices.

l accomplish my objects by lhat certain construction and arrangement of parte ohe hereinafter more specilicallv pointed out and claimed.

Figure l is a front elevation of m50-device.

Figure 2 is an eleva-tion with the diaphragm and is connecions insecion.

Figure 3 is fa section of the snap retaining ring.

Figure l is a detail seccion 'taken on the line i- 4 of IFigure l.

Figure 5 is a ydetail section haken on the line 5-5 of Figure l.

Figure 6 is a rear View of the Washer and nut structure.

Figure 7 is a side elevation of the nut.

Figure 8 is an edgevvise view of the parts shown in Figure 6.

Figure 9 is a detail of che lower seciion of 'the conical diaphragm,

l have illustrated my device as being mounted in structure having a hase l, with a pedestal 2, to which is secured a metal ring' 3. The ring,` is lined with a piece of felt 'illustrated at; Il, Where the diaphragm will Contact therewith The cone diaphragm is indicated at la.

vThe ring is formed by a stamping thaty leaves several arms 6, which are brought io a center in a .slightly conical shape, Where is mounted the casing 7 of an electromagnehic receiver, Whose armature is indicated at 8, and is connected With a Wire 9.

The end of the Wire threaded as indicated at l0, and in mounting the conical diaphraginV l in he main ringT it is I'irst set in place, with the wire passing 1'chron 'h a hole 'in the center ci the cone. Washers l2 yand 13 are set over the Wire, and nuts M and l5 on the wire are turned to clamp the apex: of che cone between the said Washers. The tension the connection mathe receiver armature Wih the cone can thus he readilg,Y adjusted when assembling, anda preliminary test given to get fille tension correctly applied.

I Ordinarily once set, the tension ab this point of connection is not changed, although it is practical to do' sofand as Will he seen the attachmen'cl of the diaphragm to che armature Wirecontrols Jche pressure of illeA edge of the cone against the felt seat in the mounting ring.

As shown the ring' 3 is formed of a metal stamping and is curled over-partially on the side away from Jche felt surfacing. The snap ring or split ring 14a is arranged to t into the cavity in the ring 8, land when the diaphragm is in place this ring le is set into the main ii'ing at the top and Worked in down the sides and at the bottom, since it is a split body', and can he. easily contracted.

In order to spread the ring and hold in rfast in place against jarring loose,and at the saine time to preventa person wising he conical diaphragm around and thus running a chance oi' breaking oif the armature Wire, I provide a structure Which is detailed in a. number of the views. This is ni preferred inode of accomplishing my ohgect.

A washer 2O is provided Which is of deco rati've appearance and engages the outside oi the split ring7 overlapping the edges at the slit portion,` so as to conceal the line or separation. rllhis Washer has a tongue' 2l which is arranged to serve as a retainer against revolution of a nut on the Washer screw as will he noted. A notch 22 ai; the lower end of the cone diaphragm is enx @aged by Jhis screw with `the result of preventing the diaphragm from being revolved. A nut 23 having a. conical outer face, is held 'to the washer by a screw 24C which is jche screw above referred to. The nut 23 has a notch whereby it engages over the tongue 21, thus permitting the screw to he turned down and the Washer and nut brought together without revolving the nut. The operator arranges the Washer and nut together on she sereni, and drops the nut inside the splitring, the dividing coin he- JWeen its ends, and arranges the diaphragm so that its notch is engaged hy the tongue on the Washer. He then turnsrbhe screw which 52S Lessons draws the nut into the space between the two meetingy ends of the split ring. rThis .eze pands the ring, due to the tapered or conical face of the nut and thus holds the ring tighti ly ,in place in the cavity of the outer ring.4

The tongue on the Washer lies in the flange ot the supported ring, thereby preventing itfrom being dropped too low to hide the joint.

The face of the split rinpT is covered with a telt surfacing; Q5 and the proportion of the parts is such that the conical diaphragm rests upon telt and does not contact with any metal. nor isit in engagement With the felt 'ot' either ring except to the extent of resting against that of the outer ring, with the felt of the split ring ljently touching i s surface.

A possible modification would he to stitch the felt to the conical diaphragm itself, but this I do not find so satisfactory, as it is my object to mount the diaphragm with its peripheriv floating, and tree oi solid engagement so far as possible. There are also a number of Ways ot clamping',r Jthe split :ringy in 'expanded position atter it has been inserted. l

.Having thus described my invention, what I/claim yas new and desire to secure by liet ters Patent, is1- 1. In a cone diaphragm loud speaker, the combination ot a supported ring., cone dia phrag'm. a split rinfr located Within the suported rimT and means concealing; the s lit.

ci L

in the latter ring and held thereto. said means engaging a notch in the cone diaphragm.

2. In a cone diaphragm loud speaker, the combination with a supported ring, a cone diaphragm held thereon` and having a cen.- tral aperture for conneetion'with a receiver armature, a receiver having an armature mounted in coniieetion with the supported ring., and having a wire projecting' therefrom, said; Wire threaded at its ends` and nuts on the Wire and movable to engage the cone at the inside and the outside1l tor adjusting the tension or" said diaphragm, and means for retainingV the diaphragm in the said supported ring* 3. ln a cone diaphragm loud speaker, the combination ot a supported ring', a split ring7 a diaphragm adapted tf he held between` said rings, and means engaging the split ring so as to conceal the split therein? said means being adapted to spread the ringf at. the point ot split.

(l. In a cone diaphragm lend speaker, the con'ibination of a supj'iorted ring, split ring, a diaphragm adapted to be held between said rings. and means engaging the split so as to conceal the split thor said means being` adapted to spreaf'i the ringry at the point et split. said means Yharmed as a Washer, having;

a screw therein, and a conical nut on the screw and pulled therebgi into the space between the ends ot the ring.

5. ln a cone diaphragm loud speaker the combination ot' a supported ring, a split ring, a diaphragm adapted to be held between said rings, and means engaging the split ring so as'to conceal the split therein, said means being adapted to spread the ring; at the point ot" split. and said means having a projection adapted to engage a notch in the cone to hold said cone against revolution.

6, ln a cone diaphragm loud s1 )eal\ei,-the combination of a supported rino, a split ring7 a diaphragm adapted yto be held between said rings, and means engaging the split ring to hold it in expanded position in the supported ring, said diaphragm having anotch therein, and said means havingl1 a member to enter said notch7 thus/ holding the diaphragm against revolution.

7. In a conediaphragm loud speaker7 the combination oit 'a supported ring, a member mounted thereom between lwhich member and the ring a conical diaphragm is sup ported. and means `for holding said member in position on the supported ring;7 a. notch in said diaphragm. said means arranged to engage said notch and prevent the diaphragm 'trom being; rotated.

8. in a cone diaphragm loud speaker, the combination ot a supported ring a member mounted theryeonr` between which member and the rin;r a conical diaphragm ia'supporteds means `For holding said membe'r in position on the supported ring, and an ele ment in connectionwith the member' and its holding means tor retainingr thediaphragm in position against rotation in the supported ring, said diaphragm beine; arranged to rest at. its periphery between said rings, but tree of beingr gripped thereby.

ln a cone diaphragm loud speaker har ine; an annular supporting: member` a cone diaphragm. a split rin;5v member engaging said supporting' member. and ulapted to secure the peripheral edge et" said diaiihragm between said ring and said supportingmember, said cone diaphrap': provided with means to prevent rotation thereof. and cooperatingr means disposed between said support and said ring; adapted to interlock with said diaphragm rotation preventing means.

l0. In a cone diaphragm loud speaker haviner an annular supporting member, a cone diaphragm, a split ring member engaging said supporting' memben and adapted -to secure the peripheral edge oi" said diaphragnn between said ringv and said supporting inember, and a clamping` member engaging said .split ring. 

